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Procedure:
. 20 drops of sample water was take in a dry test tube with a calibrated pipette.
. Adjusting the pH of the solution to 7-10 by adding 1 drop of NaOH or H2SO4.
. Adding 2 drops of potassium chromate indicator to the tube.
. With another pipette add silver nitrate solution drop wise, stirring the solution till the colour turns permanent reddish tinge.
. Count the number of drops of silver nitrate solution.
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